On the iterative approximation of optimal joint source-channel decoding

被引：66

作者：

Görtz, N ^{[1
]}

机构：

[1] Univ Kiel, Fac Engn, Inst Circuits & Syst Theory, Kiel, Germany

来源：

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS | 2001年 / 19卷 / 09期

关键词：

concatenated codes; iterative decoding; joint source-channel coding; MAP algorithm; soft-in/soft-out decoding; turbo (de)coding;

D O I：

10.1109/49.947031

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Joint source-channel decoding is formulated as an estimation problem. The optimal solution is stated and it is shown that it is not feasible in many practical systems due to its complexity. Therefore, a novel iterative procedure for the approximation of the optimal solution is introduced, which is based on the principle of iterative decoding of turbo codes. New analytical expressions for different types of information in the optimal algorithm are used to derive the iterative approximation. A direct comparison of the performances of the optimal algorithm and its iterative approximation is given for a simple transmission system with "short" channel codewords. Furthermore, the performance of iterative joint source-channel decoding is investigated for a more realistic system.

引用

页码：1662 / 1670

页数：9

共 16 条

[1] OPTIMAL DECODING OF LINEAR CODES FOR MINIMIZING SYMBOL ERROR RATE [J].

BAHL, LR ;

COCKE, J ;

JELINEK, F ;

RAVIV, J .

IEEE TRANSACTIONS ON INFORMATION THEORY, 1974, 20 (02) :284-287

[2] Near optimum error correcting coding and decoding: Turbo-codes [J].

Berrou, C ;

Glavieux, A .

IEEE TRANSACTIONS ON COMMUNICATIONS, 1996, 44 (10) :1261-1271

[3]

FINGSCHEIDT T, 1999, P IEEE SPEECH COD WO, P75

[4]

FINGSCHEIDT T, 1997, P ICASSP 97 MUN GERM, V3, P1667

[5] Combining Hidden Markov Source Models and Parallel Concatenated Codes [J].

Garcia-Frias, Javier ;

Villasenor, John D. .

IEEE COMMUNICATIONS LETTERS, 1997, 1 (04) :111-113

[6] Joint source channel decoding using bit-reliability information and source statistics [J].

Gortz, N .

1998 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY - PROCEEDINGS, 1998, :9-9

[7]

GORTZ N, 2000, P 3 ITG C SOURC CHAN, P267

[8] Iterative decoding of binary block and convolutional codes [J].

Hagenauer, J ;

Offer, E ;

Papke, L .

IEEE TRANSACTIONS ON INFORMATION THEORY, 1996, 42 (02) :429-445

[9] SOURCE-CONTROLLED CHANNEL DECODING [J].

HAGENAUER, J .

IEEE TRANSACTIONS ON COMMUNICATIONS, 1995, 43 (09) :2449-2457

[10]

HAGENAUER J, 1989, P IEEE GLOBECOM DALL, V3, P1680

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